The waterfall lights are completely self-contained; plug them in and watch the custom controller sequence of lights move in a soothing manner. There are 8 sequences of animation with the controller. Each waterfall set is 16 feet long and made up of ten strands of lights wired on a 40"" harness. A strand is made of clear wire with 96 blue LEDs, each spaced six inches apart for a total of 960 LEDs in a waterfall set. They are great for animated displays, accent lighting in your home, business, or light park. UL listed for indoor and outdoor use.